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HA21

Immune21l
Note the difference between the endothelial cells with oblong, pale nuclei (arrowheads) and the small lymphocytes with round, dark nuclei (arrows) traversing by diapedesis through the HEVs (HA21). There are a large number of lymphocytes beneath the basement membrane of the HEV. The other cell types are reticular cells/fibroblasts and dendritic cells, but these cannot easily be distinguished.